钻削与电火花小孔组合加工装置及实验研究

Research on the Device and Experiment of Combined Drilling and EDM Small Hole Machining

结合当前金属基陶瓷涂层材料工件打孔时出现二次装夹带来的定位误差的问题,提出了先利用表面涂覆金刚石刀具的钻头对陶瓷层材料进行钻削加工,待其金属基材裸露之后采用电火花小孔加工金属层。为实施两种加工方法,改造实现了双主轴专用装置,针对金属层电火花小孔加工设计开发了半桥逆变脉冲电源,搭建了放电伺服控制系统,开发了伺服控制程序。设计了两种加工方法自动切换电路,为实现加工过程自动化提供了基础。对表面涂覆氧化锆的钛合金复合材料进行连续打孔实验,实验结果表明该组合加工方法可以实现金属基陶瓷涂层材料小孔加工,连续打孔时公差范围小于10μm。

Combined with the positioning error caused by the second clamping during the drilling of the metal matrix ceramic coating material,the paper puts forward that the ceramic layer material should be drilled by using the drill bit coated with diamond cutter first,and then the metal layer should be machined by EDM after the metal substrate is exposed.In order to realize the implementation of the two machining methods,the special device of double spindles is reformed and realized.The half bridge inverter pulse power supply is designed and developed for the metal layer EDM small hole machining,the discharge servo control system is built,and the servo control program is developed.Two kinds of automatic switching circuits of machining methods are designed,which provide the basis for the automation of machining process.In this paper,the continuous drilling experiment of titanium alloy composite coated with zirconia is carried out.The experimental results show that the combined processing method can realize the small hole processing of metal matrix ceramic coating materials,and the tolerance range of continuous drilling is less than 10μm.